These are puzzling:

where [term]=@term and ([position]=@position) >=0

and [value_per_month]=@value_per_month >=0

Could you please explain what you're trying to accomplish? I just don't follow.

[position] is a column in your table, and @position would be a variable/parameter.

so say you have something like

DECLARE @position INT = 10;

SELECT ...

FROM ...

WHERE [position] = @position;

would evaluate to

SELECT ...

FROM ...

WHERE [position] = 10;

what do you mean about @position>=0 ? Is that supposed to be part of an IF statement?